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02-28-2019, 04:59 PM
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#1
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Senior Member
Join Date: Oct 2017
Location: Delaware
Posts: 279
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AC runs 24/7, PITA!
Why do rv acs have to run all the time. Why can't the fans cycle on and off like the compressors?
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02-28-2019, 05:04 PM
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#2
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Senior Member
Join Date: Sep 2010
Location: Eastern Ontario
Posts: 4,167
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make sure thermostat fan is set to "auto" mode instead of fan "on"
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Fonzie
2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
2019 F350 Ruby Red 6.7l diesel 3.31 axle electronic locker
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
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02-28-2019, 05:11 PM
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#3
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Senior Member
Join Date: Apr 2016
Location: Port Charlotte Fl/Hinsdale Ma
Posts: 4,823
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x's 2. put the fan in AUTO. just like at home. that is if you have A/C at home. 
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02-28-2019, 05:27 PM
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#4
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,802
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Very common issue.
Should have a thermostat manual, that will have instructions.
If not, download one.
As was said, you probably have set on HI or LOW fan setting.
Should be on AU.
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.) 
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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02-28-2019, 07:07 PM
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#5
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Senior Member
Join Date: Oct 2017
Location: Delaware
Posts: 279
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It is always set on auto. Hi/Lo fan does nothing. So you guys are saying the fan should cycle on and off as the compressor does? Just like My home AC does?
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02-28-2019, 07:15 PM
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#6
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Senior Member
Join Date: Nov 2015
Posts: 4,223
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Quote:
Originally Posted by Lee Pedrick
It is always set on auto. Hi/Lo fan does nothing. So you guys are saying the fan should cycle on and off as the compressor does? Just like My home AC does?
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Yes.
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BIRDS AREN’T REAL
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03-01-2019, 12:17 AM
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#7
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Senior Member
Join Date: Apr 2016
Location: Port Charlotte Fl/Hinsdale Ma
Posts: 4,823
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Quote:
Originally Posted by Lee Pedrick
It is always set on auto. Hi/Lo fan does nothing. So you guys are saying the fan should cycle on and off as the compressor does? Just like My home AC does?
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x's 2
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03-01-2019, 12:21 AM
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#8
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Always Learning
Join Date: Nov 2011
Location: Four Corners, FL
Posts: 21,891
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Quote:
Originally Posted by Lee Pedrick
It is always set on auto. Hi/Lo fan does nothing. So you guys are saying the fan should cycle on and off as the compressor does? Just like My home AC does?
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Yes, with the fan on Auto, it should cycle.
With the fan set to Hi or Low, it'll stay on 24/7.
Make sure you're not mixing the "auto" setting which decides if it should turn on heat or A/C depending on temperature with the actual fan setting.
__________________
Officially a SOB with a 2022 Jayco Precept 36C
Checkout my site for RVing tips, tricks, and info | Was a Fulltime Family for 5 years, now we're part-timing on long trips
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03-01-2019, 12:34 AM
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#9
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Senior Member
Join Date: Feb 2018
Location: TEXAS
Posts: 9,209
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Quote:
Originally Posted by Lee Pedrick
Why do rv acs have to run all the time. Why can't the fans cycle on and off like the compressors?
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On most travel trailer rooftop units, the fan does run all the time. I can't remember the wording in our manual, but it has something to do with air circulation. It is definitely annoying. Our mini MH has the same type of unit and it gets turned off when not needed and the windows opened.
__________________
2015 Dynamax REV 24TB class C
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03-01-2019, 12:39 AM
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#10
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Senior Member
Join Date: Apr 2016
Location: Port Charlotte Fl/Hinsdale Ma
Posts: 4,823
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Quote:
Originally Posted by Reverse_snowbird
On most travel trailer rooftop units, the fan does run all the time. I can't remember the wording in our manual, but it has something to do with air circulation. It is definitely annoying. Our mini MH has the same type of unit and it gets turned off when not needed and the windows opened.
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Not so. It happen mostly with the newer Heat Pump units. But they too will cycle on and off if one learns how to use the t-stat.
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03-01-2019, 12:44 AM
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#11
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Senior Member
Join Date: Feb 2018
Location: TEXAS
Posts: 9,209
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Quote:
Originally Posted by cavie
Not so. It happen mostly with the newer Heat Pump units. But they too will cycle on and off if one learns how to use the t-stat.
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I guess the question would be... what kind of rig does he have and what kind of t-stat and a/c.
Just pointing out that there are rigs out there with a/c's that have no ability to cycle the fan off and on.
__________________
2015 Dynamax REV 24TB class C
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03-01-2019, 08:06 AM
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#12
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Senior Member
Join Date: Oct 2017
Location: Delaware
Posts: 279
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I'am still buttoned up for the winter for a couple more weeks. If this is something I can change, I will. Can't stand that thing running 24/7 when not necessary. Sad to say that manual was not given to me when I bought the "BRAND NEW" TT.
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03-01-2019, 08:09 AM
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#13
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Site Team
Join Date: Oct 2014
Posts: 15,294
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There are two items that can be set. One is mode and it can be heat /cool/auto. The second is fan and it can be Lo/Hi/AUTO
Make sure the fan is set to auto.
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2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
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Honda 2000I + Companion
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03-01-2019, 08:23 AM
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#14
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Site Team
Join Date: Mar 2008
Location: Louisville, KY
Posts: 10,525
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Lee, it would help us to give you better answers if we knew what you are talking about. What is the make and model and year of your rig? If you posted a photo of the thermostat that might also be helpful.
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Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
2016 Evergreen Everlite 242RBS
29' empty nest model. Blue Ox WD hitch
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03-01-2019, 02:38 PM
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#15
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Dobbs from WI
Join Date: Feb 2018
Location: Wisconsin
Posts: 110
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We like having the fan on all the time. Went it cycles off and on it disturbs everyone sleeping. Dead quiet to the fan blowing and the compressor running to dead quiet again. The white noise is comforting.
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03-01-2019, 02:56 PM
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#16
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Site Team
Join Date: Mar 2008
Location: Louisville, KY
Posts: 10,525
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Quote:
Originally Posted by Dobbs
We like having the fan on all the time. Went it cycles off and on it disturbs everyone sleeping. Dead quiet to the fan blowing and the compressor running to dead quiet again. The white noise is comforting.
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Maybe at night.... but all day long??? No thank you!
__________________
Peace!
Dan & Rita D
2017 Nissan Titan 5.6L King cab 4wd
2016 Evergreen Everlite 242RBS
29' empty nest model. Blue Ox WD hitch
(1 queen bed, large main cabin and huge bathroom)
Camping days 2010-53, 2011-47, 2012-41, 2013-41, 2014-31, 2015-40, 2016-44, 2017-63, 2018-75, 2019-32, 2020-41, 2021-49, 2022-43, 2023-66
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03-01-2019, 03:02 PM
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#17
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 21,562
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Quote:
Originally Posted by Reverse_snowbird
I guess the question would be... what kind of rig does he have and what kind of t-stat and a/c.
Just pointing out that there are rigs out there with a/c's that have no ability to cycle the fan off and on.
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...but you said " most travel trailer rooftop units, the fan does run all the time" which, as cavie wrote, is not true.
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03-01-2019, 03:44 PM
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#18
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Senior Member
Join Date: Oct 2017
Location: Delaware
Posts: 279
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2018 coachmen Catalina legacy 243 RBS. OK,,, The AC is a Coleman mach. I crawled in my trailer took a pic on my cell of the T stat of course, no manuals on my ac unit. Of course I cant figure out how to get the pic to this post.
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03-01-2019, 03:52 PM
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#19
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Senior Member
Join Date: Jan 2017
Posts: 3,290
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...most folks who run into this 'problem' are simply having the thermostat set on either LOW or HIGH and don't realize that this controls the FAN - meaning that you are telling the thermostat to run the Fan ALL THE TIME, in either Low or High speed.
...many also may not realize that AU/AUTO means that you want the thermostat to control the Fan, along with the compressor - it will then cycle it on and off, as needed.
Admittedly, though, sometimes the AUTO setting 'seems' that it, too, is allowing the Fan to run all the time, hardly ever turning off, with sometimes only a slight 'pause' while it adjust the fan from High to Low, or vice versa.
The AUTO Fan setting let's the Thermostat do the 'work', but the TEMPERATURE setting, along with the sensor's reading of your internal temperature, will determine when and how long and at what speed the Fan will run, sometimes much longer than even the compressor, and sometimes not even going off before the compressor kicks in yet again.
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03-01-2019, 04:13 PM
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#20
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Senior Member
Join Date: Jul 2017
Posts: 4,056
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Quote:
Originally Posted by Lee Pedrick
Why do rv acs have to run all the time. Why can't the fans cycle on and off like the compressors?
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Depends on what AC you have seems the new attwood AC are set to run all the time . whereas the dometic or colemans did not and you could change the fan setting
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